Screw-engine.



G. H. CHAPPELL.

SCREW ENGINE.

APPLICATION FILED FEB. 17. I916.

Patented Apr. 10, 1917.

GEORGE H. GI-IAlEPELL, OF ENGLEWOOD, NEW JERSEY;

SCREW-ENGINE.

Specification of Letters Patent.

Application filed February 17, 1916. Serial No. 78,991.

To all whom it may concern:

Be it known that I, Gnonsn H. GHAPPELL, a citizen of the United States, and a resident of Englewood, Bergen county, New Jersey, have invented new and useful Improvements in Screw-Engines, of which the following is a full, clear, and exact description.

My invention relates to improvements in engines of the rotary or turbine type, and more particularly to screw engines, as I use the principle of the screw and employ as a propelling force any pressure fluid. My invention is based 011 the well known principle that if the screw is held at the ends in bearings so that it can turn readily, and if then pressure is applied to the screw blade on one side, it will rotate the screw although the pressure is applied substantially lengthwise thereof, while if the pressure is applied to the other side of the screw blade, the screw will rotate in the opposite direction. In carrying out my idea I inclose a suitable screw in a cylinder or casing, and divide the space between the members of the spiral blade by a stationary partition which is attached to the cylinder, thus forming two spiral chambers running the whole length of the screw, so that if pressure fluid is admitted into one chamber it will press on one side of the screw blade and tend to turn the screw or piston in one direction, whereas if the pressure fluid is admitted to the other chambers it will bear on the opposite side of the blade and so turn the screw or piston in the opposite direction. It will be seen, therefore, that with an engine of this type I am able to reverse without the use of any kind of gearing, and it will be further seen that an engine of this type can be made very simply and at small expense, which will be better understood from the description which follows. Another object of my invention is to produce an engine in which the highest efiiciency can be obtained.

Reference is to be had to the accompanying drawings forming a part of this specification, in which similar reference characters indicate corresponding parts in all the views.

Figure 1 is a plan view of an engine showing my improvements.

Fig. 2 is a sectional elevation with parts broken away, and

Fig. 3 is a broken end view of the engine.

The engine has a cylinder or casing 10,

and this can be used with its contained piston as a single unlt, or as many cylinders and contained pistons can be used as desired,

as will presently appear. Within the cylinder is a screw piston 11 having a spiral blade "that the chambers 14 and 15 will be entirely separate. The partition 13 can be integral with the casing 10 or can be fastened thereto in any suitable manner. ,The ends of. the piston terminate in shafts 16 which turn in suitable bearings, and as shownthe shaft at its lower end has a gear wheel 17 meshing with the corresponding gear 18 on the shaft 19, and the latter has a fly-wheel 20 from which power can be taken. Obviously the piston can be provided with a rotary shaft from which power can be taken in any way, without affecting the invent-ion. As shown in the drawings there are three cylinders and pistons geared to a shaft, and the middle piston is shown with the partition 13 removed for the sake of clearness.

It will be obvious that the pressure fluid can be admitted to the chambers 14 and 15 in ever so many ways without in the least affecting the principle of the invention, and I have shown asimple connection in order to show an operative device, but with no intention of limiting the invention to the arrangement shown. As illustrated the pressure fluid which can be steam, gas, water or any fluid under pressure, comes in through the pipe 21 and through a two-way valve 22. By means of this valve the fluid can be deflected through the lower pipes 28 and into the lower chamber 14 of the several cylinders, or it can be diverted through the pipe 24 to the upper chamber 15 of the several cylinders. The cylinders are provided with suitable exhaust pipes 25, and there should be an exhaust for each chamber of the cylinder.

When the pressure fluid is admitted to the lower chamber 14, the fluid, if it is an Patented Apr. to, 1917.

expansible one, will press by impactagainst the upper side of the blade 12 and the pressure will be increased by expansion and so the piston 11 will be rotated in a certain direction. If, however, the pressure fluid is admitted to the chamber 15, the pressure will be on the under side of the blade 12 and consequently the piston 11 will beturned' in the reverse, direction. It will thus be seen that the reversing means is of the simplest possible character.

I claim 1. An engine of the kind described comprising a screw piston, a cylinder or casing for the piston, a spiral stationary partition following the course of the piston blade and forming two chambers the length of the piston, means for admitting pressure fluid to either chamber, and a suitable exhaust for the cylinder.

2. An engine of the kind described comprising acylinder,-a piston rotating within the cylinder and'having a spiral blade fitting again'st the cylinder wall, a spiral partition secured to the cylinder wall and following the-piston blade thereby forming two chambers, and an inlet and exhaust for both chambers of the cylinder.

3. An engine comprising a cylinder, a piston turning on a longitudinal axis within the cylinder, a spiral blade on the piston, chambers extending the length of the blade and on opposite sides thereof, and means for admitting pressure fluid to and exhausting it from said chambers.

4. An engine comprising a cylinder, a piston journaled in the cylinderends and having a shaft projecting 'from the cylinder, a spiral blade on the piston, a stationary partition following the blade and forming two chambers between the partition and the blade, means for admitting pressure fluid to each chamber, and means for exhausting said fluid from each chamber.

5. An engine comprising a cylinder, a rotary piston journaled in the cylinder, a spiral blade on the piston, a stationary partition spaced apart from the blade, means for admitting pressure fluid between the partition and blade, and means for exhausting the pressure fluid from the cylinder.

GEORGE 'H. CHAPPELL.

Witnesses WARREN B. HUTCHINSON, M. G. ODONNELL.

Copies or this patent maybe obtained 'for five cents each, by'addressing the Commissioner of Patents,

' Washington, D; 0'. 

